Not here yet either.
Got a call from the Doctors office saying that a bill was returned "undeliverable", so they wanted to verify my address and it was all correct, even on the envelope, so why was it returned???
Never got my winter property tax bill either so I called them up. Yep, it was mailed out December 1st and returned as "undeliverable". The township clerk was looking into this new problem, because he has a stack of these this year.
He said it is a problem with new equipment at the central post office in GR. If the machine can not accurately read the zip code, 1st class mail get's returned to sender, all others go in the dumpster.